Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add psylch/media-master --skill zlib-downloadgit clone --depth 1 https://github.com/psylch/media-masterWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/psylch/media-master/zlib-download)<a href="https://agentmods.dev/skills/psylch/media-master/zlib-download"><img src="https://agentmods.dev/badge/skills/psylch/media-master/zlib-download/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/psylch/media-master/zlib-download"><img src="https://agentmods.dev/badge/skills/psylch/media-master/zlib-download.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00079 | $0.02193 |
| Opus 5 | $0.00039 | $0.01097 |
| Sonnet 5 | $0.00016 | $0.00439 |
| Haiku 4.5 | $0.00008 | $0.00219 |
Grade A, and why
zlib-download scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 248 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Book Tools
Search and download books from multiple sources through a unified CLI.
Language
Match user's language: Respond in the same language the user uses.
Backends
| Backend | Source | Auth Required | Best For |
|---|---|---|---|
| zlib | Z-Library (EAPI) | Email + Password | Largest catalog, direct download |
| annas | Anna's Archive | API Key (donation) | Aggregated sources, multiple mirrors |
Preflight
Before any workflow, run preflight to check environment readiness:
python3 ${SKILL_PATH}/scripts/book.py preflight
Returns standardized JSON:
{
"ready": true,
"dependencies": { "python3": {"status": "ok"}, "requests": {"status": "ok"} },
"credentials": { "zlib": {"status": "configured"}, "annas_api_key": {"status": "not_configured"} },
"services": { "annas_binary": {"status": "ok"} }
}
- If
ready: true— proceed directly to the Workflow section. - If
ready: false— follow the Check/Fix table below, then run the Setup flow.
| Check | Fix |
|---|---|
requests missing |
bash ${SKILL_PATH}/scripts/setup.sh install-deps (or manually: pip3 install requests / uv pip install requests) |
zlib not configured |
Guide user to edit ~/.claude/book-tools/.env — set ZLIB_EMAIL and ZLIB_PASSWORD |
zlib expired |
Cached tokens expired and no email/password in .env. Guide user to re-add credentials to ~/.claude/book-tools/.env |
annas_api_key not configured |
Guide user to donate at Anna's Archive for API key, then add ANNAS_SECRET_KEY to ~/.claude/book-tools/.env |
annas_binary missing |
bash ${SKILL_PATH}/scripts/setup.sh install-annas (or manually: download from annas-mcp releases, extract to ~/.local/bin/annas-mcp) |
Setup (First-Time Only)
Only run setup when preflight reports ready: false. Guide the user through configuration interactively.
Step 1: Install Dependencies
What ships with it
6 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 248 lines · 79 tokens per session scan A dec6299a3218
zlib-download is a skill published in the GitHub repository psylch/media-master (5 stars, last pushed 6mo ago), licensed MIT. It adds 79 tokens to every session and 2,193 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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